The 2009 Honda Insight looks pretty much exactly like the 2009 Toyota Prius. I've put a photo of each above, can you tell them apart? Here are the differences:
Honda: 40 city/43 highway @ $19K
Toyota: 48 city/45 highway @ $22K
Just like the Civic hybrid, the Insight disappoints in the mileage department. I already get 35/39 (ish) in my Civic for $12,000. I spend perhaps $400 a year on case. This would save me less than $50-60 a year, so I'll never make up the difference. Even if I drove a lot, it would still take years.